import { describe, expect, it } from 'vitest'
import type { H3Event } from 'h3'
import {
  shouldBlockImageHostRequest,
  shouldBlockSiteHostImageRequest,
  shouldBlockUnknownHostRequest
} from './host-isolation'

function mockEvent(): H3Event {
  return {
    node: { req: {}, res: {} },
    context: {}
  } as H3Event
}

describe('shouldBlockImageHostRequest', () => {
  const imageHost = 'image.example.com'
  const siteHost = 'admin.example.com'

  it('does not block when separation is inactive', () => {
    const event = mockEvent()
    expect(shouldBlockImageHostRequest(event, {
      separationActive: false,
      requestHost: imageHost,
      method: 'GET',
      pathname: '/settings'
    })).toBe(false)
  })

  it('blocks non-image paths on image host', () => {
    const event = mockEvent()
    expect(shouldBlockImageHostRequest(event, {
      separationActive: true,
      imageHost,
      requestHost: imageHost,
      method: 'GET',
      pathname: '/settings',
      hideFolder: false
    })).toBe(true)
  })

  it('allows image paths on image host', () => {
    const event = mockEvent()
    expect(shouldBlockImageHostRequest(event, {
      separationActive: true,
      imageHost,
      requestHost: imageHost,
      method: 'GET',
      pathname: '/images/2026/08/demo.webp',
      hideFolder: false
    })).toBe(false)
  })

  it('blocks POST on image host even for image paths', () => {
    const event = mockEvent()
    expect(shouldBlockImageHostRequest(event, {
      separationActive: true,
      imageHost,
      requestHost: imageHost,
      method: 'POST',
      pathname: '/images/2026/08/demo.webp'
    })).toBe(true)
  })

  it('does not block site host admin paths', () => {
    const event = mockEvent()
    expect(shouldBlockImageHostRequest(event, {
      separationActive: true,
      imageHost,
      requestHost: siteHost,
      method: 'GET',
      pathname: '/api/images'
    })).toBe(false)
  })
})

describe('shouldBlockSiteHostImageRequest', () => {
  const imageHost = 'image.example.com'
  const siteHost = 'admin.example.com'

  it('does not block when separation is inactive', () => {
    const event = mockEvent()
    expect(shouldBlockSiteHostImageRequest(event, {
      separationActive: false,
      requestHost: siteHost,
      method: 'GET',
      pathname: '/images/2026/08/demo.webp'
    })).toBe(false)
  })

  it('blocks image paths on site host', () => {
    const event = mockEvent()
    expect(shouldBlockSiteHostImageRequest(event, {
      separationActive: true,
      siteHost,
      requestHost: siteHost,
      method: 'GET',
      pathname: '/images/2026/08/demo.webp',
      hideFolder: false
    })).toBe(true)
  })

  it('blocks public image paths on site host', () => {
    const event = mockEvent()
    expect(shouldBlockSiteHostImageRequest(event, {
      separationActive: true,
      siteHost,
      requestHost: siteHost,
      method: 'GET',
      pathname: '/2026/08/demo.webp',
      hideFolder: false
    })).toBe(true)
  })

  it('blocks legacy date short paths on site host', () => {
    const event = mockEvent()
    expect(shouldBlockSiteHostImageRequest(event, {
      separationActive: true,
      siteHost,
      requestHost: siteHost,
      method: 'GET',
      pathname: '/2026/08/demo.webp',
      hideFolder: true
    })).toBe(true)
  })

  it('allows admin paths on site host', () => {
    const event = mockEvent()
    expect(shouldBlockSiteHostImageRequest(event, {
      separationActive: true,
      siteHost,
      requestHost: siteHost,
      method: 'GET',
      pathname: '/'
    })).toBe(false)
  })

  it('does not block image paths on image host', () => {
    const event = mockEvent()
    expect(shouldBlockSiteHostImageRequest(event, {
      separationActive: true,
      siteHost,
      requestHost: imageHost,
      method: 'GET',
      pathname: '/images/2026/08/demo.webp'
    })).toBe(false)
  })
})

describe('shouldBlockUnknownHostRequest', () => {
  const imageHost = 'image.example.com'
  const siteHost = 'admin.example.com'

  it('does not block when separation is inactive', () => {
    const event = mockEvent()
    expect(shouldBlockUnknownHostRequest(event, {
      separationActive: false,
      requestHost: 'pages.dev',
      siteHost,
      imageHost
    })).toBe(false)
  })

  it('blocks unconfigured third host when separation is active', () => {
    const event = mockEvent()
    expect(shouldBlockUnknownHostRequest(event, {
      separationActive: true,
      requestHost: 'pages.dev',
      siteHost,
      imageHost
    })).toBe(true)
  })

  it('blocks admin paths on image host when host is unconfigured', () => {
    const event = mockEvent()
    expect(shouldBlockUnknownHostRequest(event, {
      separationActive: true,
      requestHost: 'old-img.example.com',
      siteHost,
      imageHost
    })).toBe(true)
  })

  it('allows configured site host', () => {
    const event = mockEvent()
    expect(shouldBlockUnknownHostRequest(event, {
      separationActive: true,
      requestHost: siteHost,
      siteHost,
      imageHost
    })).toBe(false)
  })

  it('allows configured image host', () => {
    const event = mockEvent()
    expect(shouldBlockUnknownHostRequest(event, {
      separationActive: true,
      requestHost: imageHost,
      siteHost,
      imageHost
    })).toBe(false)
  })

  it('allows localhost in development', () => {
    const previous = process.env.NODE_ENV
    process.env.NODE_ENV = 'development'
    const event = mockEvent()
    expect(shouldBlockUnknownHostRequest(event, {
      separationActive: true,
      requestHost: 'localhost',
      siteHost,
      imageHost
    })).toBe(false)
    process.env.NODE_ENV = previous
  })
})